hard bottom (rock, sand) generally a SI sensitivity of 5-7
soft bottom (mud) generally a touch higher…10-ish.
Just a little toying with the SI sensitivity and contrast (in the SI enhance menu option) will help you identify the best settings for the waters you’re looking at.
Auto works great for me. 
In a lot deeper water/softer bottom, I’ll run up closer to the max sensitivity… (I know you’ll be using it on Lake Michigan 
)
Generally, though, its much less – like Jason says… All just depends on conditions.
Lets get on Wissota and run some SI trials this summer!! 
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